Column clamp for radial drills



May 21, 1935. I JKC. CARLTON 2,002,469

,QOLUMN CLAMP FOR RADIAL DRILLS Fild Sept. 2, 1933 '3 Sheets-Sheet l Nl EN TOE.

y 1935- Jpc. CARLTON 2,002,469

COLUMN CLAMP FOR RADIAL DRILLS Filed Sept. 2, 19:55 s Shqets-Sheet 2 all y 1935- J. c. CARLTON 2,002,469

COLUMN CLAMP FOR RADIAL DRILLS Filed Sept. 2, 1953 s Sheets-Sheet 5 7 Patented May 21, 1935 UNITED STATES PATENT OFFICE COLUMN CLAMP FOR RADIAL DRILLS Jack 0. Carlton, Cincinnati, Ohio, assignor to The Carlton Machine Tool Company, Cincinnati, Ohio, a corporation of Ohio Applicationseptember 2, 1933, Serial No. 688,008

21 Claims. (01. 77-48) 7 My invention is exemplified in a radial drilling and separated at their sides and inner ends from machine. V each other and from the sleeve or column, and are It is the custom of the operator of drilling mausually .resilient and sufliciently normally free chinery having a swingable arm provided with a from the' coacting clamping member to permit. 5 spindle slide, to adjust the arm and the slideso rotation between the sleeve or column and its ,5 that the point of the drill secured to the spindle coacting member when the cheeks are in unis coincident with the point on the work with clamped relation.

which the point of the drill is to co-operate. Such The sleeve and cheeks are usually castings of machines employ a clamp for fixing the drill-arm gray iron and the clamping force exerted isgreat inadjusted position. to spring the cheeks into clamped relation. 1Q

Radialdrills usually employ a rotatable column e m Veme S f t Clamping Cheeks-toward upon which the drill-arm is adjustable to elevaand from the enacting m b r are but I tion and which is rotatable when swinging the v f und at in p i e th re is unevenes drill-arm to various radial positions, the clamp or dissimilarity in contact or coaction between the 5 for clamping the drill-arm in radial position beresp ive ch eksand he coac in m m r, which ing usually at the lower end of the rotatable is inherent in the mechanism despite the greatest column. V care and accuracy in manufacture. This uneven In structures of this character now in general ness or dissimilarity in contact or coaction reuse the clamping of the rotatable support results Stilts in Shifting ween the S eve and i s 00- go inrotative urge upon the rotatable column or acting member du the p g Operation, 2Q

arm, or partbeing clamped, with the result of and results in disarrangement of the adjusted change in adjusted position of the adjusted part, ati n tw en t pa ts, id n d a iv instanced as the point of the drill, with relation tilting Ot Creeping, Walking. h to the point on the work with which it is to cotween the parts.

t, causedby t l i I have further found that such unevenness or 25 In other words, when the operator clamps the dissimilarity can be counteracted 01 minimized drill-arm after adjustment, he disarranges the y qu y g h Clamping-position the padjustment t th xt t th t th point of t ing action between the respective cheeks and the drill no longer registers with the point on the coacting member to Cau multaneous Or even work with which it is to coact in the drilling clamping action y both ChefikS,Whereby rotative 30 o er ti n, urge between the parts is avoided, so that the re- The effective positioning of th part adjusted lations between the clampingmembers are not has, therefore, heretofore been largely guesswork, disturbed during Clamping, and e a jus ed rethe operator in his adjustment of the point of latiOIl between the pal'ts'obtained Prior to amp the drill approximating the distance to which ing is maintained after t e C a ping. 35 the drill point would shift in clamping the drill- This is especially obvious and useful in a radial arm, and setting the drill-point accordingly, drill in which very slight Var at O du This shifting varied with the extent to which the Clamping at t n e d Of the arm or sleeve clamp bearing had been relieved for permitting e multiplied y times at the P 1 t e 40 swinging of the drill-arm, and withthe distance drill, Which point is removed from the axis 011 40 lengthwise of the drill-arm to which the' drillwhich the arm swings a times the distance slide had been shifted for positioning the drill, of the clamping cheeks from said axis. and other factors not necessary to mention, so It s the ject O y invention to provide novel that the conditions present for various adjustclamping means which maintain the clamped 5 ments varied, and the operator had no guidance element in adjusted position; further, to provide or certitude of the ultimate position of the drillnovel clamping means wherein the clamping efpoint after adjustment and clamped relation of feet of opposed cheeks is equalized; further, to the drill-arm. provide novel means supplemental to the clamp- It is the practice when employing clamping ing means for effecting C p W t ut dis- 5 means for a rotatable sleeve or column compristurbance of the adjusted relation of the parts ing clamping cheeks and meansfor clamping said clamped; and further, to provide novel means cheeks against a coacting member, to form the qualifying the normal relations between clampcoacting clamping faces as nearly concentric as ing parts to counteract disturbing movements of possible. The clamping cheeksare usually intethe clamping elements. Z

gral at their outer ends with the sleeve or column My invention consists in novel means for avoiding the objections hereinbefore stated; further, in a clamp bearing with an adjustable cheek or checks to control the clamping; further, in novel means whereby the point of the drill is maintained, after clamping, in the position to which it has been adjusted before clamping; and further, in a drilling machine in which disturbance of adjusted position of the drill is counteracted or minimized.

My invention will be further readily understood from the following description and claims, and from the drawings, in which latter:

Fig. 1 is a front elevation of an exemplifying radial drilling machine embodying my invention.

Fig. 2 is a plan view of the same.

Fig. 3 is a horizontal section of the same, taken on the irregular line 3-3 of Fig. 1, partly broken away.

Fig. 4 is a vertical section of the same, taken in the plane of the line 4-4 of Fig. 3, partly broken away.

Fig. 5 is a side elevation showing my improved device applied to each check of the clamp, and partly broken away.

Fig.6 is a side elevation of a first modification of my improved device, partly broken away.

Fig. '7 is a horizontal section of the same, taken on the line |-l of Fig. 6, partly broken away.

Fig. 8 is a front elevation of a second modificationof my improved device, partly broken away.

Fig. 9 is a vertical section of the same, taken in the plane of the line 9-9 of Fig. 8, and partly broken away.

Fig. 10 is a horizontal section of a third modification of my improved device, taken in the plane of the line l0l0 of Fig. 11, partly broken away.

Fig. 11 is a vertical section of the same, taken in the plane of the line H-ll of Fig. 10, partly broken away.

Fig. 12 is a vertical section of a fourth modification of the same, taken on a line corresponding to the line ll-|I of Fig. 10, and partly broken away" Fig. 13 is a side elevation of a fifth modification of my improved device, partly broken away.

Fig. 14 is an end view of the same, partly in section and partly broken away.

Fig. 15 is a vertical section of the same, taken in the plane of the line l5l5 of Fig. 13, partly broken away; and,

Fig. 16 is a horizontal section of the same,

7 taken on the line Iii-l6 of Fig. 13, part-1y broken away.

The exemplified drilling machine comprises a usual base 2| from which a post 22 extends rigidly upward (Figs. 1 and 2). A rotatable col-- umn 23 surrounds the post, bearings 24, 25 being located respectively between the upper portions and the lower portions of the post and column for centering the column about the post.

A drill-arm 26 has a clamp-bearing 21 about the column and extends radially outwardly from the rotatable column or sleeve. The drill-arm is provided with usual guideways 28 for slidably supporting a drill-slide 29.

A drill-spindle 3B is journaled and axially feedable and adjustable on the slide. The spindle has a usual'drill 3| secured thereto.

lengthwise of the drill-arm toward and from the column by suitable usual means, either by hand or power, and the drill-spindle is feedable up and down by usual means for coaction with the work, a piece of which is exemplified at 38, secured to the table 39 of the base.

The drill-arm is adjustable to various radial positions by swinging the same with its rotatable column or sleeve about the post, and is arranged to be clamped in fixed positions. The latter clamp is exemplified at 58, and as shown comprises a skirt 5|, which forms part of the column or sleeve 23 and rotates therewith. The skirt is received about an enlargement 52 or stub of the post.

The skirt comprises cheeks 53, 54, which are shown integral with the skirt, the outer ends of the cheeks being integrally connected with the skirt (Figs. 1, 3 and 4). The lower ends of the cheeks are shown coincident with the lower end of the skirt. There are slits 55, 56 between the upper ends of the cheeks and the body of the skirt, and the inner ends of the cheeks are separated by a slit 51.

The inner face iii of the skirt, including its cheeks, is normally concentric with the outer face 62 of the coacting clamping portion of the post, the latter usually having an annular groove 63 therein. The inner face of the skirt and-the outer face of the coacting member are in practice usually machined into cylindrical form, and when one is fitted over the other there is preferably ready relative rotation between them for permitting ready swinging of the drill-arm into desired radial positions. These concentric faces are in practice normally very close together, with little play between them, so that rapid clamping eifect may be had between them.

This clamping effect is obtained by a suitable clamping device 5!! acting on the cheeks, and is exemplified as including a tension-rod 65 located in bearings 55, 61 at the proximate ends of the respective cheeks. The rod may, for instance, be a threaded rod, an operating nut 68 being threaded thereto. The cheeks are drawn toward each other in annular direction about said post.

A handle 69 is fixed to the nut for rocking the same. The inner end of the nut 68 has end contact with the bearing 67, so that, when the handle is rocked in one direction, for instance upwardly, the nut is moved axially away from the bearing til, for separation between the bearings 65, 61 and the respective cheeks, and movement of the cheeks away from their coacting member or post, for release of the clamp and of the rotatable colrunn or sleeve, in order to permit swinging of the drill-arm.

Movement of the handle in the opposite direction, for instance downwardly, causes approach between the bearings 55 and 67 and the cheeks, and clamping movement of the cheeks toward their coacting member or post, for causing clamping of the clamp-hearing and of the rotatable column and drill-arm to the post after adjustment thereof.

A limit nut Ill is threaded to the outer end of the threaded rod and is fixed in adjusted positions thereon, as by a jam-nut l2, and is for the purpose of adjustably limiting separation between the bearings 66, 67 and the cheeks for unclamped relation of the clamp, and for adjusting the normal position of the handle.

A set-screw T3 is threaded in the bearing 66 and engages a flat face is on the threaded .rod for preventing turning of the threaded rod. The

its, t ue adjus m n rotative shifting or creeping of the adjusted part threaded rod hasaxial movement in its bearin s for, permitting adjustments and clamping.

The clamping means. exemplified are .iilustra tive, and any other usual or ordinary clampin when-h d sires to'drill a hole iniavpie e o work. to e yat th zdri arm :to des red hei ht nd toielemp th bea in .21 at th inn r end o th orill erm. to the rotatable it H enact. After this hasbeen done, the operator e em e ole p'tflf rfix e he column a d drilharm n ih ted redia po tion. 7

--;[,t has been found, however; that withdevices fth s na a he ofo e ns ru ted epsh tn ot he adjusted p rt nam ly, of th poi t of t eo i l n th empli oetion, tak s leo durin the clamping action, with the result that the position of the adjusted part is changed from This change is due to a inthe clamping operation.v It'is no doubt due to a quicker or more intimate contact of one of the clampin cheeks than the other with the coacting member. w

.I have analyzed this deflection as due toclamp- 1 8, and have come to the conclusion that it is inherent in cla-mping mechanism as heretofore constructed. I have, therefore, provided means q alif g he cla pm effec of the c ampin means or the normal relative positions of the c amping a 1 a omplish h pr ably yadi h relative normal positions of the clamping cheeks or adju tin their rela ive res enc or chan in h r la i l mpin m m nts or o ments or clamping effects of the same, so as to neutralize or reduce or minimize the detrimental shifting urge of the clamping means.

The shifting effect at the clamp is multiplied many times at the-point of th dljil which is distanced from the axislof the rotatable column or hear n ma y times the distanc th htact faces between the cheeks and thepost from sai a is. i

Whetheror not axial coincidence between the axes of the c amp bear ng and i s ooaotin n is ma ntai ed du n cla ed and unola ped r a i e, h u k or re ntim t contact of one v h eh e th n he th r with the a tine member, may be due to greater or more ready yield of either one of the cheeks, to a difference i a omi u ur o qua t y or ar an ement of metal in the respective checks, or .to' other causes which may not be apparent from surface examination.

In practicethe clamp'bearing for fixing the inner end of the drill-arm or rotatable column tothe post is usually a. casting of, grey iron inte gral' withthe part whioh rotates with the1.dril1- arm, instanced as the rotatable column, while in practice the coacting faces of this clamp-bearing and its coacting member are: machined to ac-. curatedimen sions, the clamping effects of, the respective clamp-cheeks may not be identical;

These clamping checks are in usual practice resilient members which are integral partsof the clamp-bearing and are normally out of clamping contact with their coacting member, re-

quire great pressure to draw the cheeks toward each other and into intimate clamping con a with the meeting member. Variations in lamm ing' movement, in resiliency or in moments of clamping may take plac between he r spe tiv cheeks in the clamping operation.

Any such variations have a det me ef c the maintenance of adjusted relation during clamping, evidenced by a greater or more ready movement of "either Check, or variation in clamping pressure between the cheeks, or of uneven applications of such pressures between the cheeks, andcause detrimental shifting of the adjusted part during the clamping operation.

Uneven contact or uneven pressure or uneven resistance to pressure between the cheeks and their coacting member during such clamping movement causes shifting of the adjusted memher out of adjusted position during the clamping opera n- Rotative urge upon and rotative movement, creeping or walking of the rotatable column and the drill-arm about the postis thereby caused in d awing theskirt clampingly about the post or stub. i w In order to correctsuch variations, I have providedsupplemental means wherewith to qualify the clamping action between the cheeks. Ihave foundthat such qualifying means applied to one of the checks is effective for correcting theevils stated, but such qualifying means may be applied to either cheek or to both cheeks, if desired. I prefer to make one of the cheeks more yieldable than the other and to apply the qualifying; means to the. more yieldable cheek whereby the resist ances or movements of the cheeks may be equalized.

' One of the cheeks may be made moreyieldable thanits mate by making, the samethinner, but I p fer to p du c re e y l by increasing the length of one of the slits 55, 55, as note the greater length; of the slit in Figs 3, thereby increasing the yielding properties of the cheek 53.

I prefer to locate the slit 5! in my improved device on the side of the column opposite the drill arm so that the overhang effect of the drill arm and slide on the clamp 50 is minimized.

The qualifying means may amplify or reduce the load upon either check or the relative loads between the cheeks, and maymodify the relative approach. between the cheeks and the coacting member, or may cause more intimate approach or less approach, or'oifer greater resistance, or less resistance to either cheek. The dimensions of thedifferences are usuallyso small that they are not observable by the naked eye. I Referring to Figs. 1 to 4 inclusive, I provide an arm 8| between a check and the .body of the clamp, thearm being fixed to or integral with to saidbody. This arm is preferably of steel'and supplementsthe check 53.. It is spaced from the check; as at. l

bolt, is rotatable in a bearing in the other end of said arm and has threaded connec- .tion, asat 86, withthe eheek53. The head 81 of the bolt forms a shoulder for the arm at one side of the arm, and the, bolt may also be provided with a collar, 88 fixed tosaidbolt, as by a pin .89, at the .otherside of said varm, there e a sp 90 et n the h ad and collar and the bo y of thearm, so t at o ntaotmey bemade either of the head with the arm or the collar with the arm, to provide clearance in opposite direction for'relative axial movement between the bolt and the arm." w

The bolt 84 may be rotated for causing contact of its head with the arm and thereby urge the cheek 53 outwardly with relation to the cheek 54, orsaid bolt may be rotated for 'causing'coaction between its collar 88 and the arm for causing inward urge or movement upon the check 53 relatively to the cheek 54.

These respective adjustments are made, depending on the difference in resiliency or mobility or clamping effect there may be between the cheek 53 and the cheek 54.

The desired adjustment between the cheek and the arm may be readily ascertained by observing whether there is any variation from the adjusted position of the adjusted member during the clamping action, and if there is any such movement, by observing the direction in which the movement takes place.

If there is a creeping or rotative shifting movement of the point of the drill in counter-clockwise direction, the probability is that there is quicker or more intimate contact of the righthand cheek than the left-hand cheek with its coacting member, and that a corresponding compensating inward movement of the left-hand cheek is required for correcting such creeping or rctative shifting.

If there is clockwise movement of the point of the drill during the clamping action, it is probable that quicker or more intimate contact is madeby the left-hand cheek with its coacting member than by the right-hand cheek, and that an adjustment of the bolt 84 is advisable, which will delay ormake less intimate the contact of the left-hand cheek, by adjusting the cheek 53 outwardly, so as to equalize its function with the function of the right-hand cheek.

In certain relations of adjustment the resiliency of the arm supplements and in others reduces the resiliency of the cheek with which it coacts.

.In Fig. 5 an arm and its attachments similar to that shown in Figs. 3 and 4 are exemplified in connection with each of the cheeks, corresponding parts of the right-hand arm being designated by similar but primed reference numerals.

In Figs. 6 and '7 I showa first modification, in which the arm and connecting parts therefor are designated by similar numerals raised to the series I00. In this exemplification the arm I8! has one end thereof fixed to the body ofthe skirt by extending integrally therefrom, the arm being curved to correspond with the curvature of the skirt, the other end of the arm being provided with the adjusting bolt I84, and its attendant parts,.-constructed and operating similarly to the adjusting bolt and its corresponding parts exemplified in Figs. 1 to 4 inclusive. In this instance also a similar arm and its connections is shown provided for the other cheek of the clamp-bearing.

A second modification of the arm and its connecting parts is exemplified in Figs. 8 and. 9, in which the arm takes the form of a lever, similar parts of the arm and its connections being designated by similar reference numerals raised to the series 200. In this exemplification the lever 28! is pivoted on a pivot pin 20!. in pivot lugs 202 of the body of the skirt.

One end of the lever is jointed to the cheek by a joint comprising a pin 203 received through a hole in ,the end of the lever and holes in lugs 204 on the cheek. The other end of the lever is adjustable and has a fork 205 received in an annular groove 206 of a nut 201, having annular shoulders-at the respective ends of the groove. The fork has rounded tines 208 to engage the shoulders. Adjustment of the nut qualifies the condition or position of the lever or arm. The nut has a knob 209 for rotating the same, and has threaded connection with a threaded rod 2 l I] pivotedto the column by a pivot pin 2| 1 received through a hole in the inner end of said threaded rod and holes in pivot lugs 212 on said column.

The adjustment of the threaded nut has operative efiect upon the arm and upon the cheek with which it has connection similar to the corresponding devices shown in Figs. 1 to 4 inclusive. A similar lever and its connections may be provided for the other cheek.

In each of these instances the resiliency of the arm, which is preferably of steel, may supplement the resiliency of the cheek in the clamping action, and the parts may be adjusted for either causing approach of the cheek toward its coacting face or recession of the check from its coacting face.

In the exemplification in a third modification shown in Figs. 10 and 11, the arms and connecting parts are designated by similar reference numerals raised to the series 300. In this exemplification an arm is shown for each of the cheeks, the arm and its connections forthe right-hand cheek being designated by similar but primed ref erence numerals.

In this case each of the arms is fixed to the body of the skirt similarly to the structure shown in Figs. 1 to 4 inclusive, as by means of bolts 382. threaded bearing 385 in the overhanging end of the arm. Its inner end is arranged to make contact with its coacting cheek for pressing the cheek inwardly, and causing outward resilient movement of the arm.

v In this instance the resiliency of the arm supplements or qualifies the resiliency of the cheek for aiding in moving the cheek inwardly during the clamping movement, in order to equalize the clamping efiects between the clamping cheeks upon the coacting clamping face.

In a fourth modification shown in Fig. 12, similar parts are designated by similar numerals raised to the series 400. The bolt 484 has threaded connection in a threaded hole 486 in the cheek 45%. Upon inward threaded movement of the bolt, the cheek 453 is urged outwardly. Each of the cheeks is preferably provided with one of these adjustments, so that each cheek may be adjusted or urged outwardly with relation to the other. The resiliency of the arms supplements the resiliency of the cheeks.

A fifth modification isshown in Figs. 13, 14, 15 and 16, in which the relative adjustment between the cheeks is obtained by eccentric bushings located about the clamp rod. One of these bushings is shown for each of the cheeks, although one may be employed for only one of the cheeks, especially if such cheek be more yieldable than its mate, as hereinbefore explained in connection With Figs. 1 to 4 inclusive.

In this modification similar parts are designated by similar reference numerals raised to the series 500. An eccentric bushing M3 is located in the bearing 566 of the cheek 553, and an eccentric bushing M3 'is located in the bearing 55'! of the cheek 554, these bearings being enlarged to accommodate the bushings The threaded rod 565 is located in the bushings. The

A bolt 384 has threaded connection in a bushings are provided with flanges 5M, -5l4' at the outer ends of the bearings, theouter ends of the bushings receiving the thrusts of the units on the threaded rod.

The respective bushings are rotatively adjusted in the bearings by a suitable spanner wrench the lugs of which are received in notches 5| 5, 5l5f arranged about the outer peripheries of the flanges.

The adjustment of each bushing moves the cheek in which it is located inwardly or outwardly with relation to its mate for adjusting the clamping relation between the cheeks. One of the bushings is provided witha segment slot 5|6 to accommodate the set screw 513.

The bushing is located in adjust d positions, as by having the 'outer peripherypf itsiiange provided with teeth 5 I 1, with which the teeth of a latch 5 l 8 coast, the latch being clamped in latching position by a bolt 5! threaded into a lug, 520 on the bearing in which the bushing is located.

It is obvious that other changes, or modifications may be made in obtaining the. relative adjustment between'the cheeksrthan those herein particularly shown or described, within the scope of my invention set forth in the accompanying claims.

My improved device is simple and effective for correcting the faults of an otherwise useful and admirable device; which is in extensive use in spite of its faults, but the faults of which have not heretofore been recognized identified or corrected. I believe I have done this, and have therefore herein explained my inventionas far as I now understand the same, and having thus fully explained my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In steadying means for thesetting of a tool in a drilling machine, the combinationwith the drill-arm on which the tool is located, and means for adjusting said drill-arm and the tool thereon into various radial positionsof a ,clamp bearing for said arm comprising resilient'cheeks and a part toward which said checks are clamped, meansclamping said cheeks toward said part, and means adjusting the relativeresilience between said. cheeks for adjusting the relative clamping moments between said cheeks and said part so that'said cheeks are clamped simultaneous.- ly and equallyfor maintaining said clamp bearingand 'said'part in adjusted relation throughout the clamping.

2. In a radial drilling machine, the combination of a post, a rotatable: column adjustable about said post provided .Witha skirt having resilient cheeks integral therewith arranged to clamp about said post, operating means between said checks to clamp'saidcheeks, an arm between said rotatable column and a cheek, and adjusting means, having operative connections with said arm and said cheek adjusting the resiliience'of said cheek relatively to its companion cheek; to equalize the resistance to fiexure of said cheeks so that said cheeks are clamped simultaneously and equally about said post to maintain adjusted position of saidcolumnabout said post during the clamping. I 3. In a radial drilling machine, the combination of a post, a rotatable column adjustable .about said post provided with a skirthaving resilient cheeks of different" resiliencies integral "with said skirt arranged to clamp about said post; operating means-between said cheeks to normal resiliencies between said cheeks to adjust the relative clamping moments of said cheeks.

4. In a radial drilling machine, the combination of a post, a rotatable column about said post provided with a skirt having resilient checks of a different lengths integral with said skirt arranged to clamp about said post, operating means between said cheeks to clamp said cheeks, and adjusting means acting on the longer of said cheeks for adjusting its normal resilience relative to the normal resilience of the other of said cheeks whereby to adjust the relative clamping moments of said cheeks.

- 5.. In a drilling machine, the combination of an upright, a rotatable column about said upright, a clamp-bearing for the latter about said upright, a drill-arm extending outwardly fromsaid column, a drill slide thereon, a rotatable drill-spindle on the latter arranged to support a tool, said bearing having oppositely extending resilient cheeks having normal resiliencies, operating means between said cheeks to draw said cheeks toward each other and said bearing about said upright to clamp said bearing about said upright, and means adjusting the normal resiliencies between said checks for equalizing the resiliencies of said cheeks with relation to each other to equalize the clamping relations between said cheeks and said upright so as to steady the setting of said tool during the clamping by said operating means.

6. In a drilling machine, the combination of an upright, a rotatable column about said upright, a clamp-bearing for the latter about said upright, a drill-arm extending outwardly from said column and arranged to be adjusted to radial positions about said upright, a drill-slide adjustable along the latter, a rotatable drill-spindle on said drill-slide arranged to support a tool, said bearing, having resilient cheeks having normal resiliencies extending toward'each other, operating means between'said cheeks to draw said cheeks toward each other to. clamp said hearing about said upright, and radially acting means changing the resiliencies between said cheeks to equalize their clamping effects upon said upright whereby to maintain the adjusted position of said column and to maintain the adjusted position of said tool between its adjustment and the clamped relation of said bearing. 1

'7. In a radial drilling machine, the combination of an upright, a rotatable column about said upright, a drill-arm extending outwardly from said column and adjustable with said column to radial positions about said upright, a drill-slide adjustable lengthwise of said drill-arm toward and, from said column, a rotatable drillspindle on said drill-slide arranged to support a tool, said rotatable column comprising, a skirt having resilient cheeks having normal resiliencies and extending integrally therefrom toward'each other about said upright, operating means between said cheeks to draw said cheeks toward each, other about said upright to clamp said column thereto, an arm and adjusting means between said column and a cheek having resilient action on said cheek to substantially change the resilient action of said cheek with relation to the resilient action of the other of said cheeks so that said checks are clamped simultaneously and equally to maintain circumferential adjusted position ofsaid column about saidsupports 8. In a drilling machine, the combination, set

forth in claim I 7, in l which the adjusting; means operate in both of opposite directions to change thejnormal resilient action of said cheek.

V 9. In a radial drilling machine, the combination 'of an upright, a rotatable column'about said upright, a drill-arm extending outwardly from said column and adjustable with said column to radial positions about said upright, a drill-slide adjustable lengthwise of said drill-arm toward and from said column, a rotatable drillspindle on said drill-slide arranged to support a tool, said rotatable column comprising a skirt having resilient cheeks extending integrally therefrom toward each other about said upright, operating means between said cheeks to draw said cheeks toward each other about said upright to clamp said column thereto, resilient arms between said column and said respective cheeks, and adjusting means having operative connec tions with said respective arms to vary the resiliencies of said cheeks by imposing thereon resiliencies of said arms to equalize the clamping properties of said respective cheeks so that said cheeks are clamped simultaneously and equally to maintain the adjusted radial position of said drill-arm.

f 10. In a radial drilling machine, the combination of an upright, a rotatable column about said upright, a drill-arm extending outwardly from said column and adjustable with said column to radial positions about said upright, a drill-slide adjustable lengthwise of said drill-arm toward and from said column, a rotatable drill-spindle on said drill-slide arranged to support a tool, said rotatable column comprising a skirt having resilient cheeks extending integrally therefrom toward each other about said upright, operating means between said checks to draw said cheeks toward each other about said upright'to clamp said column thereto, and an arm having operative connections with a rigid portion of said column and a cheek, said arm and said operative connections having resilience imposed upon the resilience of said cheek during unclamped relation of said cheek whereby to equalize the relative clamping relations between said cheeks and said upright so-that said cheeks are clamped simultaneously and equally about said upright for maintaining adjusted position of said tool during the clamping.

11. In a radial drilling machine, the combination of an upright, a rotatable column about said upright a drill-arm extending outwardly from said column and adjustable with said column to radial positions about said upright, a drill-slide adjustable lengthwise of said drill-arm toward and from said column, a rotatable drill-spindle on said drill-slide arranged to support a tool,

saidrotatable column comprising a skirt having resilient cheeks extending integrally therefrom toward each other about said upright, operating means between said cheeks to draw said cheeks toward each other about said upright to clamp 'taneously and equally about said upright for maintaining adjusted position of said tool during the clamping. l

:12. In a metal working machine, the combinaother and toward said coacting member for clamping said bearing to said coacting member, and an arm and adjusting means having resilient properties and located between said bearing and a cheek thereof qualifying the normal resilience of said cheek and equalizing the resiliencies between said cheeks so as to clamp said cheeks simultaneously and equally to said coacting member to prevent circumferential movement between said bearing and said coacting member during the clamping.

13. In a metal working machine, the combination of machine parts comprising a bearing and a coacting member having rotary adjustment between them, said bearing provided with resilient clamping cheeks, clamping means to clamp said cheeks to said coacting member, and means adjusting the normal clamping moment of a cheek with relation to the clamping moment of its mating cheek to equalize the clamping moments between said cheeks for simultaneously and equally clamping said cheeks to said coacting member.

14,. In steadying means for the setting of a tool in a drilling machine in which the tool is mounted on a radial arm adjustable angularly to various radial positions and a clamp bearing is employed to clamp the radial arm in adjusted radial positions, the combination of the bearing comprising resilient clamping cheeks, clamping means for said cheeks, and a substantial resilient arm having connection with a cheek mentioned in manner to impose substantial stress upon said cheek to equalize the clamping actions of said cheeks so-that the cheeks are clamped simultaneously and equally to prevent angular movement of the radial arm throughout the clamping movement of the clamping means.

15. In steadying means for the setting of a tool in a drilling machine in which the tool is mounted on a radial arm adjustable angularly to various radial positions and a clamp bearing is employed to clamp the radial arm in adjusted radial positions, the combination of the bearing comprising resilient clamping cheeks, clamping means for said cheeks to clamp said bearing, and substantial means acted on by said clamping means in manner to forcefully shift the normal clamping position of a cheek mentioned so that said cheeks are clamped simultaneously and equally to prevent angular movement of the radial arm throughout clamping movement of the clamping means.

16. In steadying means for the setting of a tool in a drilling machine in which the tool is mounted on a radial arm adjustable angularly to various radial positions and a clamp bearing is employed to clamp the radial arm in adjusted radial positions, the combination of the bearing that the cheeks are clampedsimultaneously and tool in a drilling machine, the combination with the drill-arm on which the tool is located and means for adjusting said drill-arm and the tool thereon into various radial positions, of a clamp bearing for said drill-arm comprising clamping cheeks having normal clamping properties and a part toward which said cheeks are clamped, clamping means clamping said cheeks toward said part, and means adjusting the clamping properties between said cheeks so that said cheeks are clamped simultaneously and equally toward said part to maintain said drill-arm and said tool in adjusted radial position throughout the clamping movement of said clamping means,

18. In steadying means for the setting of a tool in a drilling machine in which the tool is mounted on a radial arm adjustable angularly to various radial positions and a clamp bearing is employed to clamp the radial arm in adjusted radial positions, the combination of the bearing comprising clamping cheeks having normal clamping properties and a part toward which said cheeks are clamped, clamping means clamping said cheeks toward said part, and means acting laterally on a cheek to adjust the clamping properties between said cheeks so that said cheeks are clamped simultaneously and equally toward said part to maintain said drill-arm and said tool in adjusted radial position during the clamping movement of said clamping means.

19. In a metal working machine employing a clamp bearing and a coacting member having rotative adjustment between them, the combination of the clamp bearing provided with resilient cheeks extending toward each other, clamping means between said checks to clamp said bearing to said coacting member, and means adjusting the resilience of a cheek mentioned with relation to its companion cheek in manner to equalize the resistance to flexure of said cheeks by said clamping means so that said cheeks'are clamped simultaneously and equally to maintain said rotative adjustment throughout clamping movement of said clamping means.

20. In a metal working machine employing a clamp bearing and a coacting member having rotative adjustment between them, the combination of the clamp bearing provided with resilient cheeks extending toward each other, clamping means between said checks to clamp said bearing to said coacting member, and means adjusting a cheek mentioned adjusting its normal distance from said coacting member andits normal resilience with relation to its companion cheek so that said cheeks are clamped simultaneously and equally to said coacting member to maintain said rotative adjustment throughout clamping movement of said clamping means. I

21. In a metal working machine, the combination of a clamp bearing and acoacting member having rotative adjustment between them, said bearing provided with resilient cheeks extending toward each other, clamping means between said cheeks to clamp said cheeks to said coacting member, means adjusting the resilience of a cheek mentioned in manner to equalize the clamping moments and stresses of said cheeks upon said coacting member so-that said cheeks are-clamped simultaneously and equally to maintain the rotative adjustment made between said bearing and said coacting member throughout clamping movement of said clamping means.

JACK C. CARLTON. 

